<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登陆表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    data(){
      return {
        //这是登录表单的数据绑定对象
        loginForm:{
          username:'admin',
          password:'123456'
        },
        loginFormRules:{
          //验证用户名是否合法
          username:[
            { required: true, message: '请输入登陆账号', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
          ],
          //验证密码是否合法
          password:[
            { required: true, message: '请输入登陆密码', trigger: 'blur' },
            { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
          ]
        }
      }
    },
    methods:{
      resetLoginForm(){
        // console.log(this);
        this.$refs.loginFormRef.resetFields();
      },
      login(){
        this.$refs.loginFormRef.validate(async valid=>{
          if(!valid) return;
          const {data:res}=await this.$http.post('login',this.loginForm);
          if (res.meta.status!==200)
          return this.$message.error("登陆失败！");
          this.$message.success("登陆成功");
          // 1. 将登陆成功之后的token，保存到客户端的sessionStorage中
          //   1.1项目中除了登陆之外的其他API接口，必须在登陆之后才能访问
          //   1.2token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
          window.sessionStorage.setItem("token",res.data.token);
          // 2.通过编程式导航跳转到后台主页，路由地址是 /home
          this.$router.push("/home");
        })
      }
    }
  };

</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }

</style>
